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diff --git a/core/src/main/scala/org/apache/spark/TaskState.scala b/core/src/main/scala/org/apache/spark/TaskState.scala
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark
+
+import org.apache.mesos.Protos.{TaskState => MesosTaskState}
+
+private[spark] object TaskState
+  extends Enumeration("LAUNCHING", "RUNNING", "FINISHED", "FAILED", "KILLED", "LOST") {
+
+  val LAUNCHING, RUNNING, FINISHED, FAILED, KILLED, LOST = Value
+
+  val FINISHED_STATES = Set(FINISHED, FAILED, KILLED, LOST)
+
+  type TaskState = Value
+
+  def isFinished(state: TaskState) = FINISHED_STATES.contains(state)
+
+  def toMesos(state: TaskState): MesosTaskState = state match {
+    case LAUNCHING => MesosTaskState.TASK_STARTING
+    case RUNNING => MesosTaskState.TASK_RUNNING
+    case FINISHED => MesosTaskState.TASK_FINISHED
+    case FAILED => MesosTaskState.TASK_FAILED
+    case KILLED => MesosTaskState.TASK_KILLED
+    case LOST => MesosTaskState.TASK_LOST
+  }
+
+  def fromMesos(mesosState: MesosTaskState): TaskState = mesosState match {
+    case MesosTaskState.TASK_STAGING => LAUNCHING
+    case MesosTaskState.TASK_STARTING => LAUNCHING
+    case MesosTaskState.TASK_RUNNING => RUNNING
+    case MesosTaskState.TASK_FINISHED => FINISHED
+    case MesosTaskState.TASK_FAILED => FAILED
+    case MesosTaskState.TASK_KILLED => KILLED
+    case MesosTaskState.TASK_LOST => LOST
+  }
+}